import 'package:bloc/bloc.dart';
import 'package:flutter/material.dart';
import 'package:freezed_annotation/freezed_annotation.dart';
import 'package:remever/components/notifiers/home_screen_data.dart';
import 'package:remever/database/database.dart';
import 'package:remever/inject.dart';

part 'collection_state.dart';
part 'collection_cubit.freezed.dart';

class CollectionCubit extends Cubit<CollectionState> {
  CollectionCubit() : super(CollectionState.data());

  /// Нотифаер домашнего экрана
  CollectionData get _cd => getIt<CollectionData>();

  /// Контроллер скролла для коллекции
  final ScrollController collectionController = ScrollController();

  /// Позиция скролле
  double _previousScrollOffset = 0.0;

  /// Индекс выбранной фильтрации коллекции
  int collectionFiltersIndex = 0;

  void initScrollListener() {
    collectionController.addListener(() {
      final double currentScrollOffset = collectionController.offset;
      final bool isScrollingDown = currentScrollOffset > _previousScrollOffset;

      if (isScrollingDown) {
        _cd.showFab(false);
      } else {
        _cd.showFab(true);
      }

      _previousScrollOffset = currentScrollOffset;
    });
  }

  @override
  Future<void> close() {
    collectionController.dispose();
    return super.close();
  }

  Future<void> toLoadingState() async {
    emit(CollectionState.loading());
  }

  Future<void> toDataState() async {
    emit(CollectionState.data());
  }

  Future<void> toEmptyState() async {
    emit(CollectionState.empty());
  }

  Future<void> toErrorState() async {
    emit(CollectionState.error());
  }
}